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Subject[PATCH] isdn: mISDNinfineon: fix potential NULL pointer dereference
Date
In case ioremap fails, the fix returns -ENOMEM to avoid NULL
pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
---
drivers/isdn/hardware/mISDN/mISDNinfineon.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/isdn/hardware/mISDN/mISDNinfineon.c b/drivers/isdn/hardware/mISDN/mISDNinfineon.c
index 3e01012be4ab..0fe6ddcb3fdc 100644
--- a/drivers/isdn/hardware/mISDN/mISDNinfineon.c
+++ b/drivers/isdn/hardware/mISDN/mISDNinfineon.c
@@ -712,8 +712,11 @@ setup_io(struct inf_hw *hw)
(ulong)hw->addr.start, (ulong)hw->addr.size);
return err;
}
- if (hw->ci->addr_mode == AM_MEMIO)
+ if (hw->ci->addr_mode == AM_MEMIO) {
hw->addr.p = ioremap(hw->addr.start, hw->addr.size);
+ if (unlikely(!hw->addr.p))
+ return -ENOMEM;
+ }
hw->addr.mode = hw->ci->addr_mode;
if (debug & DEBUG_HW)
pr_notice("%s: IO addr %lx (%lu bytes) mode%d\n",
--
2.17.1
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